rtc: Undo the once-per-second wake up

So... waking up once per second turns out to be a dumb idea because it
regresses the stop watch and HRS tools (which now also only wake up once
per second).

Undo this change but sprinkle a few more micropython.native decorations
on methods used on the wakeup path to minimise power.

Fixes: fb18705b9b9cc ("manager/rtc: Experimental power saving technique")
Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>

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